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L STEINBERGER AND- G. HILL INSULATED SUPPORT F v ECTRICAL CONDUCTORS.

APPuckTmM NOV; 26, 1920.

Reissued M18, 1921.

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Specification ot Reissue Letters Patent. 'Reisguefl J 18." 1921'; Original n. 1342mm men ca e 1, 1920, Serial No. 212,324, filed January '17, 1913. Application for re= issue filed November as, 1920. semi 1w. 420,6;24.

To all (whim it may concern Bei :known that we, Lou s smmimmm GUY HILL, citinens of the United States, and residents, respectively, of the borough of Brooklyn, city and State of New York,

' ."and-"Washington,'-D. 0., have jolntly 1n-'- ventedcertain new a'nd useful Improvements inlnsulated Supports for Electrical'Con doctors; of which the following is speci- 'fication.'

Our invention relates particularly "to insulated inductance coils in radio apparatus. One of the objects 1s to provide a mount ing for the inductance coil constructed entirely of insulating material and which is rigidly, and intimately secured to said inductance coil throughout the length of the coll.

molding operation.

1 portions of the volutes of the coil being sep- Another object is t combine a mounting of insulatingmateria' with the inductance coil in such fashion as to secure the coil rigidly to the'insulating materialat a single QAnother object is to provide means for rigidly securing the inductance coil to a support of insulating material, the embedded arated by the insulating material.

Another object is to provide a coil of such" shape that it may be readily and efficiently mounted uponthe insulatingsupport, the

- projecting portion having a larger cross-sectional area than that of the embedded or on- .choring portion, so as to have a great amount of electrical carrying capacity.

Another object is. to give the inductance coil such configuration that when one edge is embedded in the insulating material it will provide an undercut portion thereby oifording a good anchorage in the insulating material, the exposed edge of the coil being at the same time also provided withan undercut portion, therebyaffording a" goorl gripping Surface of the sliding contact member. Owing to the undercut portion, the

sliding contact member cannot become dis connected from the exposed edge of the coil even though the apparatus be greatly jarred or shaken up from the rolling of the ship or from any cause whatever- Another object is -to fashion the anchoring portion so as to form static shields thus rediicing to a. minimum the effect of a brush discharge.

the support.

Other objects will appear hereinafter from the specification and claims.

Referring to the drawings, in which similar characters indicate the same parts in the several views; Figure. l isa plan view of an insulating support and an inductance coil secured there to embodying our invention.

Fig. 2 1s a section on line 21-22 of Fig. 1,

coils being shown. secured to both sides of 'F g. 3 isan enlarged section broken away showing the mounting of the coil-in the insulating supporton one side only thereof.

Fig. 4 is a fragmentary View partly in: section showing another form of coil and or' shape of metal strip, and We have thus il1ustrated two shapes of, strips as shown respcctwelyat C and C 1n the several views ofthe drawingv Our invention contemplates not only the securing of the coil upon one side of the insulating plate, but also on both sides of the plate as illustrated in Fig. 2. y

The insulating material used in the construction of this inventon may. be of any.

suitable material of that nature but we prefer to .use.tl1e insulating. material which is known in the art as electrose.

The strip from whichthe-inductance coil is formed is made of metal of anysuitahie kinder metallic alloy. l Vc havefound that a very efficient coil may be formed, as illustratedin Figs. 2 and 3, from wire which is commonly lnuo'wn "as trolley Wire, thecrosssection of which has a figure 8 shape. In otherwords'the upper and lower edges of the metal strip or wire are enlarged as at 10 and 11 respectively, and these enlargements are connected by 'a strip of metal. as at 12 of less width than the metal at the edges.

This form of Wire is particularly suited for our present invention because one edge 11 is so shaped ustobe readily molded into the insulating material at one operation,

drawings shall be interpreted as and thereby held securely-and firmly to the insulating material and t e outer or exposed edge 10 is also so shaped that it may be readily clamped by a contact when the inductance coil is molded for use, as for instance, in vradio apparatus. The exposed edge is also of lar er cross-sectional area than the embedde or anchoring edge and thus has a maximum electrical conductivity.

The embedded edge, because of the 0 positely projecting rounded edges 20am 21, have the function and effect of a static shield because of thej'oppositely disposed=volutes of the coil, and thus minimize the eife'ctof a brush discharge from the metal where it enters the insulating materiah'that is, brush discharge between turns overthe surface of the insulatingmaterial. The rounded edge also prevents brush discharge fromthe em- .bedded edge of the coil.

Another form of coil and means for per imanently securing the coil C to the insulating material is. shown clearly in Flg. 4

where the sides at the lower ed e of the metal ribbon or strip are provide with irregular or mutilated surfaces so that in fmolding the coil to the insulating material ters Patent is:

1. Ina device of the kind, described, a

'.coi s, molded at their 5 'port of insiilating material, a

plate or disk supporting element of insuli1ting-material, a metal coil molded at an edge thereof to a face of=the said supporting element, the cross-section of the coil having an irregular area, the insulating supporting element bein coextensive with one edge of the spiral c011. 2, In a device of the kind described, a sin e support of insulating material, metal edges to each face of:

the support.-

' 3. In a device of the kind described, a supmetal coil consisting of a wire having a figure 8 cross section, said wire being coiled and molded @inthe face of said support to a depth sub Zstantially equal to the diameter of one of the enlarged portions of the metal wire.

4. In a device of the kind described, a support of insulating material, a coil of metal of a figure 8 cross section molded at one edge toa face of theinsulating supportto an exrounded by tent that the insulating material substihtiall surrounds one of the curved portions of the Wire. p

5'. In a device of the kind described, a'su'pport of insulating material, a wire of figure 8 cross sectionmolded thereto at one edge, substantially one half of the wire being sur- .insulating material and the other halfprojecting from the insulating support. I

6. In a device of the kind described, a sup port of insulating material, a metal strip molded thereto atone edge, one of the edges having a greater area in cross section than the other edge, the edge having the greater area in cross section projecting from the surface of the-insulating support and the edge oilesser cross section being molded within he surface of the sup ort.

. 7. In iii device of the kind' escribed, a uni-- tary'base of insulating material, a coil consisting of a strip of metal molded throughout its length into the surface thereof at one edge, the cross section of the coil having anirregular shape, the. said base being co-ex-. tenslve with one edge of the coil.

8. In a'device of the kind described, a unitary base of insulating material, and a spiral coil consisting ofa strip of metal molded throughout its length into'the' surface-thereof at one edge, the cross section of the coil having an-irregular shape, one edge of said spiral coil being co-extensive with the unitary base.

9. In a device of the kind described, an agglomerate supporting base of insulating materiaha metallic coil of figure 8 cross section embedded in said supporting base to a point of minimum cross section.

10. In a device of the kind described, an agglomerate supporting base ofinsulating material, ametallic coil of figure cross section molded in said supporting base to a point 'of'minimum cross section. 11. In adevice ofthe kind described, an

ag'glomerate supporting base of insulating material, a rolled wire coil of figure 8 cross section molded point of minimum cross 'section.'.

12. In a device of the kind described, a unitary base of insulating material, a coil consisting .of ,a strip of metal molded throughout its length into thesurface thereof at one edge, the said base being co-extensive with one edge of the coil.

In' witness whereof we have hereunto set in said supporting base to a our hands at the borough of Manhattan,

city and State of New York, this fifteenth day of November, 1920.

LOUIS STEINBERGER.

GUY HILL, 

